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Introduction Section 6-1
CQM1H-series PLCs CMND sends “n” bytes of command data beginning with S (the beginning
word for storing command data at the source node) to node N. In return, “m”
bytes of response data are stored at the source node beginning with D (the
beginning word for storing response data).
Note 1. When using CVM1 and CV-series PLCs manufactured prior to April 1996,
the local network address cannot be set to “00.” Set a number other than
“00” as the local network address in the routing tables, and then specify
that number.
2. With the message service, there is no guarantee that a message to a des-
tination node will reach its destination. It is always possible that the mes-
sage may be lost in transit due to noise or some other condition. When
using the message service, it is advisable to prevent this situation from oc-
CMND
S
D
C
"n" bytes
of com-
mand
data
"m" bytes
of
response
data
S
15
0
S: Source node beginning send word
D: Destination node beginning receive word
C: Source node first control data word
Source node
Destination node N
(S –1)
+
n
2
D
(D –1)
+
m
2
Command
Response
Analysis
Execution
Destination node N
00 to 20 (Hex): 0 to 32 (or 00 to 3E (Hex): 0 to 62)
The same data can be broadcast to all nodes
on the network by setting the destination node address
to FF (Hex).
The range of node addresses will vary for networks
other than Controller Link Networks.
C+1
C+4 0 0
Number of retries
0 to F (Hex): 0 to 15 retries
0: Response required
1: Response not required
C
"n" bytes of command data
0000 to 07C6 (Hex): 0 to 1,990 words
0
"m" bytes of response data
0000 to 07C6 (Hex): 0 to 1,990 words
15 0
C+3
15 8 7 0
Destination unit address
00 (Hex): PLC's CPU Unit
01 to 0F (Hex): Computer (user program)
10 to 1F (Hex): Unit nos. 0 to 15
FE (Hex): Unit connected to network
15 10 8 7 3 0
15 10 8 7 3 0
Response monitor time
0000 (Hex): 2 s at 2 Mbits/s
4 s at 1 Mbit/s
8 s at 500 kbits/s
0001 to FFFF (Hex): 0.1 to 6,553.5 s
(Unit: 0.1 s)
C+2 0 0
15 11 8 7 0
Destination network address
00 (Hex): Local network
01 to 7F (Hex): 1 to 127
C+5
15
0
…
…
…
(02 to 0F (Hex) are used
when using Controller Link
Support Boards for PCI Bus
only.)